JEE Main 2023 — Chemistry Physical Chemistry

2023mcqmedium

Which one of the following statements is correct for electrolysis of brine solution?

Official previous-year question

Held on 31 Jan 2023 · Verified 6 Jul 2026.

Options

A
${\mathrm{Cl}}_{2}$ is formed at cathode
B
${O}_{2}$ is formed at cathode
C
${H}_{2}$ is formed at anode
D
${\mathrm{OH}}^{-}$ is formed at cathode

Did you get this right?

Solution

Brine solution is the concentrated solution of $\mathrm{NaCl}$ in water.

$\mathrm{NaCl}(\mathrm{aq}.)\rightarrow {\mathrm{Na}}_{\text{(aq) }}^{+}+{\mathrm{Cl}}_{\text{(aq) }}^{+}$

The cathode will attract the sodium ions from the sodium chloride and hydrogen ions from the water. The hydrogen ions gain 2 electrons and are reduced to form hydrogen molecules.

$2{H}^{+}(\mathrm{aq})+2{e}^{-}\rightarrow {H}_{2}(g)$

$2{H}_{2}O+2{e}^{-}\rightarrow {H}_{2}(g)+2{\mathrm{OH}}^{-}(\mathrm{aq})$

The anode will attract the hydroxide ions from the water and chlorine ions from sodium chloride. The chlorine ions lose 2 electrons and get oxidised.

${\mathrm{Cl}}_{2}\rightarrow 2{\mathrm{Cl}}^{-}+2{e}^{-}$

${\mathrm{Na}}^{+}+{\mathrm{OH}}^{-}\rightarrow \mathrm{NaOH}$

Your note

JEE Main Physical Chemistry in other years

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JEE Main 2023 — Chemistry Physical Chemistry

2023mcqmedium

Which one of the following statements is correct for electrolysis of brine solution?

Official previous-year question

Held on 31 Jan 2023 · Verified 6 Jul 2026.

Options

A
${\mathrm{Cl}}_{2}$ is formed at cathode
B
${O}_{2}$ is formed at cathode
C
${H}_{2}$ is formed at anode
D
${\mathrm{OH}}^{-}$ is formed at cathode

Did you get this right?

Solution

Brine solution is the concentrated solution of $\mathrm{NaCl}$ in water.

$\mathrm{NaCl}(\mathrm{aq}.)\rightarrow {\mathrm{Na}}_{\text{(aq) }}^{+}+{\mathrm{Cl}}_{\text{(aq) }}^{+}$

The cathode will attract the sodium ions from the sodium chloride and hydrogen ions from the water. The hydrogen ions gain 2 electrons and are reduced to form hydrogen molecules.

$2{H}^{+}(\mathrm{aq})+2{e}^{-}\rightarrow {H}_{2}(g)$

$2{H}_{2}O+2{e}^{-}\rightarrow {H}_{2}(g)+2{\mathrm{OH}}^{-}(\mathrm{aq})$

The anode will attract the hydroxide ions from the water and chlorine ions from sodium chloride. The chlorine ions lose 2 electrons and get oxidised.

${\mathrm{Cl}}_{2}\rightarrow 2{\mathrm{Cl}}^{-}+2{e}^{-}$

${\mathrm{Na}}^{+}+{\mathrm{OH}}^{-}\rightarrow \mathrm{NaOH}$

Your note

JEE Main Physical Chemistry in other years

Keep practicing Physical Chemistry

Work through every JEE Main Physical Chemistry PYQ, year by year.

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JEE Main 2023 — Chemistry Physical Chemistry

Options

Did you get this right?

Solution

Your note

JEE Main Physical Chemistry in other years

More JEE Main Physical Chemistry questions

Other Chemistry topics for JEE Main

Organic Chemistry

Inorganic Chemistry

Keep practicing Physical Chemistry

JEE Main 2023 — Chemistry Physical Chemistry

Options

Did you get this right?

Solution

Your note

JEE Main Physical Chemistry in other years

More JEE Main Physical Chemistry questions

Other Chemistry topics for JEE Main

Organic Chemistry

Inorganic Chemistry

Keep practicing Physical Chemistry